Fig. 7. GYSTOSEIRA FCENICULACEA. 
Colour. When fresh, clear, pale olive-green ; when dry, black. 
Suhstance. Tough, leathery. 
Character of Frond. Shrub-like. Stem a little compressed. Branches beset with rough points 
as if branchlets had been broken off. When young and growing in deep water, 
furnished with long, flat, cut-out, midribbed leaves, which afterwards become 
branches. 
Measurement. From 1 to 2 feet long ; of which the stem is from 4 to 6 inches. 
Air-vessels. Inflations in the branches near the ends ; small ; narrow ; oblong ; one or two 
together. 
Fructification. Minute seeds {spores) in special receptacles at the ends of the branches, 
thickening them. Receptacles minute ; very long. 
llahitat. South and South-west of England. Jersey. Rocks in tide-pools. 
Fig. 8. GYSTOSEIRA BARBATA. 
Colour. When fresh, reddish-brown ; when dry, perfectly black. 
Suhstance. Tough, leathery. 
Character of Frond. Shrub-like. Stem covered with bulbous knobs, from each of which 
springs a branch. Branches slender, cylindrical ; many times divided and branched. 
Measurement. From 12 to 14 inches long. 
Air-vessels. Inflations in the upper part of the branches ; one or two near together ; 
chain-like. 
Fructification. Minute seeds (spores) in special receptacles at the ends of the branches, 
thickening them ; tipped with a spine-like point. 
Habitat. The Mediterranean. Said to have found its way to our shores formerly ; but has 
not been found for half a century or more. 
The spine-like point of the receptacle distinguishes C. harhata from C. granulaia, with 
which its knoh-like processes might otherwise confound it. 
4 
